JSON格式的时间/Date(2367828670431)/格式转为正常的年

function formatDate(NewDtime) 
var dt = new Date(parseInt(NewDtime.slice(6, 19)));
var year = dt.getFullYear();
var month = dt.getMonth() + 1;
var date = dt.getDate();
var hour = dt.getHours();
var minute = dt.getMinutes();
var second = dt.getSeconds();
return year + "-" + month + "-" + date + " " + hour + ":" + minute + ":" + second;
}